This Tower VAL322MP is a 3 port mid-position motorised 22mm 5 wire control valve designed for boiler central heating systems. It features a mid-position spring return mechanism with 22 mm fittings and a 3 Amp auxiliary switch (SPST). The valve actuator can be replaced without draining the system. It operates on a 240V AC supply and uses industry-standard cable colours. The valve also includes a manual override lever.